San Francisco-Based Lookout Mobile Security Raises $19.5 Million.

"Lookout Mobile Security, a San Francisco-based developer of cloud-based smartphone security services, said it has raised $19.5 million in its third round of funding, led by Index Ventures. Accel Partners and Khosla Ventures also participated in the round, which the company -- which currently boasts more than four million registered users -- will use to expand its offerings."